Probe function not getting called

I am working on an ARM9 (i.MX21) board. My task is to make the imx21 HCD
driver work with in board. I am using the 2.6.16 kernel. 

I am having a small problem. 

I have compiled my usb subsystem as modules and load them properly as given
in modules.dep.  Though the driver gets loaded properly
without any errors during load time, there is no activity afterwards. I
checked /proc/interrupts and it does no show me any interrupt 
registered for the usb. After some investigation  using printk's I found out
that the probe function in the HCD doesn't get called at all. 

Under what circumstances does the probe function in my HCD driver gets
called? I read chapter 14, i.e. Linux device driver model from the 
Linux Device Drivers book. However I could not still figure out why the
function is not getting called.  

This is the platform_driver structure which is being registered with the
call to platform_driver_register:

static struct platform_driver imx21_hcd_driver = {
    .driver = {
        .name = (char *)hcd_name,
    },
    .probe  = imx21_probe,
    .remove = imx21_remove,
    .suspend = NULL,
    .resume = NULL,
};

What could be the problem? 

I have just started working on Linux device drivers and have just the basic
knowledge of the device driver model or the USB subsystem.

Thanks and Regards,
Ashtekar Kaustubh





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